Any large sudden release of thermal energy into the atmosphere. This heat causes a rapid convective updraft (that usually entrains dirt or water) capped by the rising fireball, with a rising convective updraft in its center and a falling convective downdraft on its outside surface.
This release of energy can be from conventional explosives, nuclear explosives, meteor impact, etc.
Surface burst
A shallow subsurface burst.
A nuclear detination
Surface
to create a mushroom cloud take a mushroom put it in the mirowave in for 30 mins and their you have it...A MUSHROOM CLOUD by, bob and larry. 2009
Yes, there is air in a mushroom cloud.
surface burst
subsurface
The Mushroom Cloud Effect was created in 2012.
Surface Burst
shallow subsurface
surface burst